PlayFab offers a ton of features essential for modern web based games: Leaderboards, Player Data Analytics and Multiple Live Ops features such as user segmentation, A/B testing stores and much more.
Thanks to the diligent work of the PlayFab engineers their SDK now natively supports Phaser. You can literally pair up these two amazing pieces of technology with just 2 lines of code!
A basic PlayFab account is completely free and they also offer an Indie Studio package which comes with all of their professional features at an indie friendly price.
They've published a Getting Started Guide which shows how to hook them both together, so give it a look and see how you can use it to boost your next game.